CBSE Class XII Chemistry 2017 Question Papers With Solutions

Question : 1

The formula of an oxo-anion of manganese (Mn) in which it shows the oxidation state equal to its group number is MnO42−. In MnO42−, the oxidation state of Mn is Mn + (−2 × 4) = −1 Mn – 8 = −1 Mn = +7 The group number of manganese is 7.